[linux-block.git] / net / bridge / br_private_stp.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 */

#ifndef _BR_PRIVATE_STP_H
#define _BR_PRIVATE_STP_H

#define BPDU_TYPE_CONFIG 0
#define BPDU_TYPE_TCN 0x80

/* IEEE 802.1D-1998 timer values */
#define BR_MIN_HELLO_TIME	(1*HZ)
#define BR_MAX_HELLO_TIME	(10*HZ)

#define BR_MIN_FORWARD_DELAY	(2*HZ)
#define BR_MAX_FORWARD_DELAY	(30*HZ)

#define BR_MIN_MAX_AGE		(6*HZ)
#define BR_MAX_MAX_AGE		(40*HZ)

#define BR_MIN_PATH_COST	1
#define BR_MAX_PATH_COST	65535

struct br_config_bpdu {
	unsigned int	topology_change:1;
	unsigned int	topology_change_ack:1;
	bridge_id	root;
	int		root_path_cost;
	bridge_id	bridge_id;
	port_id		port_id;
	int		message_age;
	int		max_age;
	int		hello_time;
	int		forward_delay;
};

/* called under bridge lock */
static inline int br_is_designated_port(const struct net_bridge_port *p)
{
	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
		(p->designated_port == p->port_id);
}


/* br_stp.c */
void br_become_root_bridge(struct net_bridge *br);
void br_config_bpdu_generation(struct net_bridge *);
void br_configuration_update(struct net_bridge *);
void br_port_state_selection(struct net_bridge *);
void br_received_config_bpdu(struct net_bridge_port *p,
			     const struct br_config_bpdu *bpdu);
void br_received_tcn_bpdu(struct net_bridge_port *p);
void br_transmit_config(struct net_bridge_port *p);
void br_transmit_tcn(struct net_bridge *br);
void br_topology_change_detection(struct net_bridge *br);
void __br_set_topology_change(struct net_bridge *br, unsigned char val);

/* br_stp_bpdu.c */
void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
void br_send_tcn_bpdu(struct net_bridge_port *);

#endif
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
1da177e4 LT	7	*/
	8
	9	#ifndef _BR_PRIVATE_STP_H
	10	#define _BR_PRIVATE_STP_H
	11
	12	#define BPDU_TYPE_CONFIG 0
	13	#define BPDU_TYPE_TCN 0x80
	14
14f98f25	15	/* IEEE 802.1D-1998 timer values */
	16	#define BR_MIN_HELLO_TIME (1*HZ)
	17	#define BR_MAX_HELLO_TIME (10*HZ)
	18
	19	#define BR_MIN_FORWARD_DELAY (2*HZ)
	20	#define BR_MAX_FORWARD_DELAY (30*HZ)
	21
	22	#define BR_MIN_MAX_AGE (6*HZ)
	23	#define BR_MAX_MAX_AGE (40*HZ)
	24
	25	#define BR_MIN_PATH_COST 1
	26	#define BR_MAX_PATH_COST 65535
	27
95c96174 ED	28	struct br_config_bpdu {
	29	unsigned int topology_change:1;
	30	unsigned int topology_change_ack:1;
1da177e4 LT	31	bridge_id root;
	32	int root_path_cost;
	33	bridge_id bridge_id;
	34	port_id port_id;
	35	int message_age;
	36	int max_age;
	37	int hello_time;
	38	int forward_delay;
	39	};
	40
	41	/* called under bridge lock */
	42	static inline int br_is_designated_port(const struct net_bridge_port *p)
	43	{
	44	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
	45	(p->designated_port == p->port_id);
	46	}
	47
	48
	49	/* br_stp.c */
348662a1 JP	50	void br_become_root_bridge(struct net_bridge *br);
	51	void br_config_bpdu_generation(struct net_bridge *);
	52	void br_configuration_update(struct net_bridge *);
	53	void br_port_state_selection(struct net_bridge *);
	54	void br_received_config_bpdu(struct net_bridge_port *p,
	55	const struct br_config_bpdu *bpdu);
	56	void br_received_tcn_bpdu(struct net_bridge_port *p);
	57	void br_transmit_config(struct net_bridge_port *p);
	58	void br_transmit_tcn(struct net_bridge *br);
	59	void br_topology_change_detection(struct net_bridge *br);
8384b5f5	60	void __br_set_topology_change(struct net_bridge *br, unsigned char val);
1da177e4 LT	61
1da177e4 LT	62	/* br_stp_bpdu.c */
348662a1 JP	63	void br_send_config_bpdu(struct net_bridge_port , struct br_config_bpdu );
348662a1 JP	64	void br_send_tcn_bpdu(struct net_bridge_port *);
1da177e4 LT	65
1da177e4 LT	66	#endif